In the face of these factors and the rapid pace at which atmospheric levels of CO2 and other GHGs continue to grow, it is hardly reassuring that, as physicist Russell Seitz has noted, “variables as critical as the sensitivity of the climate to the doubling
of carbon dioxide in the atmosphere have failed to converge on
uncontroversial values”.

While MIT climate scientist Richard Lindzen may think that climate “sensitivity” (mean temperature response to CO2 doubling) is as low as 0.5 degrees centigrade only a month and a half ago all of his colleagues disagreed with him in a publication trumpeted by MIT: “New projections, published this month in the American Meteorological Society’s Journal of Climate, indicate a median probability of surface warming of 5.2 degrees Celsius [9 degrees F!] by 2100, with a 90% probability range of 3.5 to 7.4 degrees [6.3 to 13.2 degrees F!]. This can be compared to a median projected increase in the 2003 study of just 2.4 degrees [and the temps reported are averages, with many places warmer].”